Before discussing data types in Java, you should be aware of the word datatype. So what is a data type? It is the type of data that a variable can store in the form of value. It can be of any kind, i.e. numerical data, textual data, character data etc. I hope you got it. If you still have any queries related to datatypes, comment below. Now let’s discuss datatypes in Java.

Data Types in Java

In java data types are divided into two groups:

1-Primitive data types

2-Non-primitive data types 

Primitive data types	Non-primitive data types
byte	string
float	arrays
int	classes
double
char
long
boolean
short

Declaring variable with datatypes in java with output

public class Main {
  public static void main(String[] args) {
    int myNum = 5;               // integer (whole number)
    float myFloatNum = 5.99f;    // floating point number
    char myLetter = 'D';         // character
    boolean myBool = true;       // boolean
    String myText = "Codelikechamp";     // String    
    System.out.println(myNum);
    System.out.println(myFloatNum);
    System.out.println(myLetter);
    System.out.println(myBool);
    System.out.println(myText);
  }
}

Output

5
5.99
D
true
Codelikechamp

Primitive Data Types in JAVA

A primitive data type is one that specifies the size and type of variable values, which means what kind of data can variable can store, and it has no additional methods.
There are a total of eight primitive data types in Java:

Data Type	Size	Description
byte	1 bytes	Stores whole numbers from -128 to 127
short	2 bytes	Stores whole numbers from -32,768 to 32,767
int	4 bytes	Stores whole numbers from -2,147,483,648 to 2,147,483,647
long	8 bytes	Stores whole numbers from -9,223,372,036,854,775,808 to 9,223,372,036,854,775,807
float	4 bytes	Stores fractional numbers. Sufficient for storing 6 to 7 decimal digits
double	8 bytes	Stores fractional numbers. Sufficient for storing 15 decimal digits
boolean	1 bit	Stores true or false values
char	2 bytes	Stores a single character/letter or ASCII values

1-Numbers(Primitive data types) Data types:

Basically java contain two types of numeric data types:

a-Integer types

These type of datatypes can stores whole numbers, positive or negative (such as 123 or -456), without decimals. Valid types are byte, short, int and long. Which type you should use, depends on the numeric value.

Byte

public class Main {
  public static void main(String[] args) {
    byte myNum = 10;
    System.out.println(myNum);  
  }
}

Output

10

short

public class Main {
  public static void main(String[] args) {
    short myNum = 2000;
    System.out.println(myNum);  
  }
}

Output

2000

int

public class Main {
  public static void main(String[] args) {
    int myNum = 200000;
    System.out.println(myNum);  
  }
}

Output

200000

long

public class Main {
  public static void main(String[] args) {
    long myNum = 25000000000L;
    System.out.println(myNum);  
  }
}

Output

25000000000

b-floating point number types

These type of datatypes represents numbers with a fractional part, containing one or more decimals. There are two types: float and double.

float

public class Main {
  public static void main(String[] args) {
    float myNum = 3.79f;
    System.out.println(myNum);  
  }
}

Output

3.79

double

public class Main {
  public static void main(String[] args) {
    double myNum = 20.99d;
    System.out.println(myNum);  
  }
}

Output

20.99

2-Boolean DataTypes

It can store values like yes/no , on/off , 1/0 etc see code below:

public class Main {
  public static void main(String[] args) {
    boolean isJavaFun = true;
    boolean isjavascriptFun = false;    
    System.out.println(isJavaFun);
    System.out.println(isjavascriptFun);
  }
}

Output

true
false

3-Character datatype

Character type datatype can store only one character either it can be a number or alphabets:

public class Main {
  public static void main(String[] args) {
    char myGrade = 'A';
    System.out.println(myGrade);
  }
}

Output

A

4-String datatype (Non-Primitive data types)

public class Main {
  public static void main(String[] args) {
    String a = "codeliekchamp.com";
    System.out.println(a);
  }
}

Output

codeliekchamp.com

Link: https://Codelikechamp.com

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